Alerts · Bootstrap v5.2

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Alerts · Bootstrap v5.2

2023-08-04 08:58| 来源: 网络整理| 查看: 265

View on GitHub Alerts

Provide contextual feedback messages for typical user actions with the handful of available and flexible alert messages.

On this page Examples

Alerts are available for any length of text, as well as an optional close button. For proper styling, use one of the eight required contextual classes (e.g., .alert-success). For inline dismissal, use the alerts JavaScript plugin.

A simple primary alert—check it out! A simple secondary alert—check it out! A simple success alert—check it out! A simple danger alert—check it out! A simple warning alert—check it out! A simple info alert—check it out! A simple light alert—check it out! A simple dark alert—check it out! html A simple primary alert—check it out! A simple secondary alert—check it out! A simple success alert—check it out! A simple danger alert—check it out! A simple warning alert—check it out! A simple info alert—check it out! A simple light alert—check it out! A simple dark alert—check it out! Conveying meaning to assistive technologies

Using color to add meaning only provides a visual indication, which will not be conveyed to users of assistive technologies – such as screen readers. Ensure that information denoted by the color is either obvious from the content itself (e.g. the visible text), or is included through alternative means, such as additional text hidden with the .visually-hidden class.

Live example

Click the button below to show an alert (hidden with inline styles to start), then dismiss (and destroy) it with the built-in close button.

html Show live alert

We use the following JavaScript to trigger our live alert demo:

const alertPlaceholder = document.getElementById('liveAlertPlaceholder') const alert = (message, type) => { const wrapper = document.createElement('div') wrapper.innerHTML = [ ``, ` ${message}`, ' ', '' ].join('') alertPlaceholder.append(wrapper) } const alertTrigger = document.getElementById('liveAlertBtn') if (alertTrigger) { alertTrigger.addEventListener('click', () => { alert('Nice, you triggered this alert message!', 'success') }) } Link color

Use the .alert-link utility class to quickly provide matching colored links within any alert.

A simple primary alert with an example link. Give it a click if you like. A simple secondary alert with an example link. Give it a click if you like. A simple success alert with an example link. Give it a click if you like. A simple danger alert with an example link. Give it a click if you like. A simple warning alert with an example link. Give it a click if you like. A simple info alert with an example link. Give it a click if you like. A simple light alert with an example link. Give it a click if you like. A simple dark alert with an example link. Give it a click if you like. html A simple primary alert with an example link. Give it a click if you like. A simple secondary alert with an example link. Give it a click if you like. A simple success alert with an example link. Give it a click if you like. A simple danger alert with an example link. Give it a click if you like. A simple warning alert with an example link. Give it a click if you like. A simple info alert with an example link. Give it a click if you like. A simple light alert with an example link. Give it a click if you like. A simple dark alert with an example link. Give it a click if you like. Additional content

Alerts can also contain additional HTML elements like headings, paragraphs and dividers.

Well done!

Aww yeah, you successfully read this important alert message. This example text is going to run a bit longer so that you can see how spacing within an alert works with this kind of content.

Whenever you need to, be sure to use margin utilities to keep things nice and tidy.

html Well done! Aww yeah, you successfully read this important alert message. This example text is going to run a bit longer so that you can see how spacing within an alert works with this kind of content. Whenever you need to, be sure to use margin utilities to keep things nice and tidy. Icons

Similarly, you can use flexbox utilities and Bootstrap Icons to create alerts with icons. Depending on your icons and content, you may want to add more utilities or custom styles.

An example alert with an icon html An example alert with an icon

Need more than one icon for your alerts? Consider using more Bootstrap Icons and making a local SVG sprite like so to easily reference the same icons repeatedly.

An example alert with an icon An example success alert with an icon An example warning alert with an icon An example danger alert with an icon html An example alert with an icon An example success alert with an icon An example warning alert with an icon An example danger alert with an icon Dismissing

Using the alert JavaScript plugin, it’s possible to dismiss any alert inline. Here’s how:

Be sure you’ve loaded the alert plugin, or the compiled Bootstrap JavaScript. Add a close button and the .alert-dismissible class, which adds extra padding to the right of the alert and positions the close button. On the close button, add the data-bs-dismiss="alert" attribute, which triggers the JavaScript functionality. Be sure to use the element with it for proper behavior across all devices. To animate alerts when dismissing them, be sure to add the .fade and .show classes.

You can see this in action with a live demo:

Holy guacamole! You should check in on some of those fields below. html Holy guacamole! You should check in on some of those fields below. When an alert is dismissed, the element is completely removed from the page structure. If a keyboard user dismisses the alert using the close button, their focus will suddenly be lost and, depending on the browser, reset to the start of the page/document. For this reason, we recommend including additional JavaScript that listens for the closed.bs.alert event and programmatically sets focus() to the most appropriate location in the page. If you’re planning to move focus to a non-interactive element that normally does not receive focus, make sure to add tabindex="-1" to the element. CSS Variables Added in v5.2.0

As part of Bootstrap’s evolving CSS variables approach, alerts now use local CSS variables on .alert for enhanced real-time customization. Values for the CSS variables are set via Sass, so Sass customization is still supported, too.

--#{$prefix}alert-bg: transparent; --#{$prefix}alert-padding-x: #{$alert-padding-x}; --#{$prefix}alert-padding-y: #{$alert-padding-y}; --#{$prefix}alert-margin-bottom: #{$alert-margin-bottom}; --#{$prefix}alert-color: inherit; --#{$prefix}alert-border-color: transparent; --#{$prefix}alert-border: #{$alert-border-width} solid var(--#{$prefix}alert-border-color); --#{$prefix}alert-border-radius: #{$alert-border-radius}; Sass variables $alert-padding-y: $spacer; $alert-padding-x: $spacer; $alert-margin-bottom: 1rem; $alert-border-radius: $border-radius; $alert-link-font-weight: $font-weight-bold; $alert-border-width: $border-width; $alert-bg-scale: -80%; $alert-border-scale: -70%; $alert-color-scale: 40%; $alert-dismissible-padding-r: $alert-padding-x * 3; // 3x covers width of x plus default padding on either side Sass mixin

Used in combination with $theme-colors to create contextual modifier classes for our alerts.

@mixin alert-variant($background, $border, $color) { --#{$prefix}alert-color: #{$color}; --#{$prefix}alert-bg: #{$background}; --#{$prefix}alert-border-color: #{$border}; @if $enable-gradients { background-image: var(--#{$prefix}gradient); } .alert-link { color: shade-color($color, 20%); } } Sass loop

Loop that generates the modifier classes with the alert-variant() mixin.

// Generate contextual modifier classes for colorizing the alert. @each $state, $value in $theme-colors { $alert-background: shift-color($value, $alert-bg-scale); $alert-border: shift-color($value, $alert-border-scale); $alert-color: shift-color($value, $alert-color-scale); @if (contrast-ratio($alert-background, $alert-color) new bootstrap.Alert(element))

For the sole purpose of dismissing an alert, it isn’t necessary to initialize the component manually via the JS API. By making use of data-bs-dismiss="alert", the component will be initialized automatically and properly dismissed.

See the triggers section for more details.

Triggers

Dismissal can be achieved with the data attribute on a button within the alert as demonstrated below:

or on a button outside the alert using the data-bs-target as demonstrated below:

Note that closing an alert will remove it from the DOM.

Methods

You can create an alert instance with the alert constructor, for example:

const bsAlert = new bootstrap.Alert('#myAlert')

This makes an alert listen for click events on descendant elements which have the data-bs-dismiss="alert" attribute. (Not necessary when using the data-api’s auto-initialization.)

Method Description close Closes an alert by removing it from the DOM. If the .fade and .show classes are present on the element, the alert will fade out before it is removed. dispose Destroys an element’s alert. (Removes stored data on the DOM element) getInstance Static method which allows you to get the alert instance associated to a DOM element. For example: bootstrap.Alert.getInstance(alert). getOrCreateInstance Static method which returns an alert instance associated to a DOM element or create a new one in case it wasn’t initialized. You can use it like this: bootstrap.Alert.getOrCreateInstance(element).

Basic usage:

const alert = bootstrap.Alert.getOrCreateInstance('#myAlert') alert.close() Events

Bootstrap’s alert plugin exposes a few events for hooking into alert functionality.

Event Description close.bs.alert Fires immediately when the close instance method is called. closed.bs.alert Fired when the alert has been closed and CSS transitions have completed. const myAlert = document.getElementById('myAlert') myAlert.addEventListener('closed.bs.alert', event => { // do something, for instance, explicitly move focus to the most appropriate element, // so it doesn't get lost/reset to the start of the page // document.getElementById('...').focus() })

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Alerts · Bootstrap v5.2

Alerts · Bootstrap v5.2

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